Example analysis of PHP regular expression matching, replacement and segmentation functions

This article mainly introduces the PHP regular expression matching, replacement and segmentation functions, briefly analyzes the PHP regular expression matching, replacement and segmentation related functions, and demonstrates the related operation skills of PHP regular expression matching in the form of examples. Friends who need it can For reference,

is as follows:

The functions of regular expressions in PHP mainly include: segmentation, matching, search and replacement.

Matching function

preg_match_all All matching functions

##

preg_match_all (string pattern,string subject,array matches[, int flags]);

Yes The results are sorted so that $matches[0] is an array of all pattern matches.

Purpose: Intercept more precise content, used to collect web pages, analyze text, etc.

Replacement function

preg_replace Regular replacement function

preg_replace(mixed pattern,mixed replacement,mixed subject[, int limit]);

Pass Regular expression to replace relevant content.

① The replacement content can be a regular expression or an array;

② The replacement content can be solved by using the modifier e to solve the replacement execution content.

Usage: Replace some more complex content, or convert the content.

Split function

preg_split Regular cutting

preg_split(string pattern,string subject[, int limit[, int flags]]);

Through regular Expression to cut related content, similar to the explode cutting function, but explode can only cut in one way.

Example demonstration

Matching function

The following is the reference content:

<?php
$str="标题：{title}内容：{content}";
$mode="/{(.*)}/U";
preg_match_all($mode,$str,$arr);
print_r($arr);
?>

Output: (View in source file)

The following is the quotation content:

Array
(
  [0] => Array
    (
      [0] => {title}
      [1] => {content}
    )
  [1] => Array
    (
      [0] => title
      [1] => content
    )
)

The above is the entire content of this article, I hope it will be helpful to Everyone’s learning helps.

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